Rotary motor.



PATENTED SEPT.'26, 1905.

2 SHEETS-snm 1;

J.v A. SHEPARD. ROTARY MOTOR.

APPLIUATION FILED un s. N1003.

' 0 A uw -wnNEssEsi ATTORNEY 010.800,330. PATENTED SEPT. ze, 1905.

J. A. SHBPARD.

RUTARY MOTOR. v

APPLIGATION FILED MAYG. 1903.

2 SHEETS-SHEET z.

Y 95 gm!! 0*, K M50 Y o WnNEssEs: K l l vmm i' www We l BY ,l ATTORNEYUNITED STATES PATENT oEEIoE.

JAMES A. SHEPARD, OF MONTOUR FALLS,'NEW YORK, ASSIGNOR TO THE GENERALPNEUMATIC TOOL COMPANY, OF MONTOUR' FALLS, NEW

vonk.

To all whom it may concern.-

Be it known that I, JAMES A..SHEPARD, a

citizen of the United States, residing at Montour Falls, in the countyof Schuyler and State of New York, have invented certain new and usefulImprovements in Rotary` Motors, of which the following is aspecification. This invention relates to improvements in rotaryreciprocating piston motors kto be driven by compressed air or otheriiuid under pressure; and the object of my invention is to provide amotor of this type which shall be particularly applicable to hoists,drills, and other portable tools and appliances and which shall embodycertain novel features of construction and operation, aswill-hereinafter be more fully set forth, andpointed outin the claims.

I attain my object by means of the construction and arrangement of theseveral parts oi' the motor as illustrated in the accompanying drawings,in which- Figure 1 represents asectional view of amotor embodying myimprovements; Fig. 2, a side` elevation of the same removed from thebearings and viewed from the right inFig. 1; Fig. 3, a plan view of themotor-cylinders and piston connections with thevalve removed;`

the valve on line 8 8 in Figs. 4 to 7, inclusive;`

and Fig. 9, a similar section on the line 9 9.

Like letters refer to like parts in the'several views.

A represents a hub which is attached to a driving-shaft B, one end of-which shaft passes out through the hub c of a stationary eccentric O,which latter is secured in a standard or other support D. Cylinders t cta" radiate Jfrom the hub A. At the other side of the motor a standard Eis provided with a circular head e, against the inner face of which arevoluble valve plate or disk F is held by means of jam-nuts screwedupon the stem f, which projects out through the head e. In

this stem or hub of disk F the reduced end b of the shaft B isjournaled. The motive luid enters a chamber g in head e by way of thepipe G and is exhausted from chamber 7L by l Specification of LettersPatent. Application led May 6, 1903. Serial No. 155,867.

`the stationary eccentric C. The pressure ex- ROTARY MOTOR.

Patented sept. 2e, 1905.

way of the pipe H. Between the valve-disk F and the face of hub A is alongitudinallymovable packing plate or disk I. This disk I is alsorevoluble with the disk F, being connected therewith by means of shorttubular pieces J, which arev fastened to one of the disks and have asliding fit in the other. The disk F is provided on its outer face withtwo ports jy", which are adapted to be brought into register with thepor-t leading from the chamber g in the head e, when the valve-disk F isturned to the right or left from its central or cut-off position. (SeeFig. 9.) From these ports y' j a cross-passage leads to the interior ofthe upper tubeJ and thence to the port v1, whence motive fluid isdelivered through ports Z in hub A to the cylinders behind the pistonsL. Diametrically opposite the port vl in disk I is a similar port 7,'for the exhaust from the cylinders. This port leads ythrough thepacking-tubeJ to port j" in disk tubes J J, are pistons adapted toreceive the -rnotive Huid behind them by way of passages his andto pressdisk I against the face of hub A, thereby insuring at all times a closelengagement between said plate and hub and brackets formed integrallywith the hub A :and the cylinders. The arms M are coupled by links m tothe pistons, and the bent arms P terminate in rollers, which ride' onerted by the pistons on these rollers through the bell-crank leverscauses said rollers to travel around the eccentric, thereby impartf ingrotary motion to the cylinders. Thusif.

-the valve be set so as to deliver the motivei fluid tov the ports Zwhenthe cylinders are passing from the position of the cylinder u1 `to theposition of cylinder a" in Fig. 2 the' tion will be from left to right.By means of v IOO the lever R the valve F may be set to cut oif themotive iuid or to deliver it to the cylinders at one side or the otherof the inlet 1, dependent upon the direction in which the motor is to berun and the degree of opening between the ports eI J', and the port inchamber g will regulate the speed of the motor. It will be noted thatthe long radius of the eccentric is set at right angles to the medialposition of the valve, or at right angles to the axis of the cylinder a,in which the piston is at its inmost position ready for the admission ofthe motive fluid, from which setting of the eccentric it follows thatthe admission of motive fluid to the cylinders at one side ortheother ofthe line which is vertical to the long radius of the eccentric willdetermine the direction of rotation of the motor.

In proportioning the motor parts I so arrange the Weights of the arms Mand the pistons coupled thereto that they will be approximatelycounterbalanced by the weights of the armsP and the wheels orrollerscarried thereby. By reason of this the centrifugal forcesdeveloped at thefree ends of the levers M and P and in their attachedparts when the motor is running at speed will be practically in balance,so that the pistons and the wheels will be held to their work withoutundue pressure on either side. The motor is thus rendered free-runningand the bearings and coupling-pins are relieved from undue strain andwear. Moreover,the running of the motor will not be affected by changesin centrifugal forces under diiferentspeeds, since all centrifugalefforts in the motor parts are practically in balance.

By this arrangement of the motor and valve it will be understood thatthe valve automatically packs itself and takes up the wear between itand the rotating hub. The motor runs smoothly at high speed, and thebearings and working parts are durable and run with little friction.While 1 have shown theshaftBjournaled in the stationary eccentric-hub, Ido not limit myself to this arrangement, as the eccentric may beotherwise supported and the shaft otherwise journaled. The motor andvalve are adapted to be readily applied to the containing casing orframe of any of the tools or appliances which can be operated by thisclass of motors, and variations in the manner of applying the valve andshaft to their supports and bearings may be -made withoutdeparture fromthe spirit of my invention. Moreover,where it is not required that themotor shall be reversible the disk F may be made integral with the heade, or, in other words, dispensed with, the packing plate or disk I insuch case being set with its ports positioned relative to the eccentric,according to the direction in which the motor is to run.

Having thus described the novel features of my motor and valve, what Iclaim as my in- Vention, and desire to secure by Letters Patent, is-

l. In a motor, a revoluble hub carrying cylinders, ports leading fromthe cylinders to a face of the hub, a longitudinally-movablc packingpla-te or disk in contact with said face, ports in said plate, admissionand exhaust openings adapted to be placed thereby in alternatecommunication with the cylinderports as the hub revolves, slip-jointsbetween the ports in said plates and the admission and exhaust openings,and means for applying the pressure of the motive iinid to said plate tohold it in contact with the hub-face.

2. In a motor, a revolublehub carrying cylinders, ports leading from thecylinders to a face of the hub, a longitudinally-movable packing plateor disk in contact with said face, ports in said plate, admission andexhaust openings adapted to be placed thereby in alternate communicationwith the cylinderports as the hub revolves, tube-sections formingslip-joints between the ports in said plate and the admission andexhaust openings, and means for holding said plate against the hubfacewith a yielding contact.

3. In a motor, a revoluble hub carrying cylinders, ports leading fromthe cylinders to a face of the hub, a longitudinally-moyable packingplate or disk in contact with said face, ports in said plate, admissionand exhaust openings adapted to be placed thereby in alternatecommunication with the cylinderports as the hub revolves, slip-jointsbetween the ports in said plate and the admission and exhaust openings,and one or more pistons pressed against said plate from a chamber orchambers in communication with the motive Huid.

4. In a motor, a revolublehub carrying cylinders, ports leading .fromthe cylinders to a face of the hub, a disk or valve plate in contactwith said face, ports in said valve-plate, admission and exhaustopenings adapted to be placed thereby in alternate communication withthe cylinder-ports as the hub revolves, means for rotating thevalve-plate whereby the admission and exhaust ports therein may beshifted to change the point of cut-ofi or the direction of rotation, aported packingplate forming` a yielding face for the valveplate,slip-joints between said packing-plate and the valve-plate at theport-openings, and pistons pressed against the liiaeking-plate fromchambers in communication with the motive fluid.

In a motor, a revoluble hub carrying cylinders, ports leading from thecylinders to a face of the hub, an admission-opening for the motiveiiuid, a disk or valve plate in contact with the hub-face, anadmission-chamber in said valve-plate, two ports leading to saidchamber, one at each side of the admissionopening, a port leading fromsaid chamber to IOO between said packing-plate and the valveplate at theport-openings, and means for applying the pressure ofthe motive fluid tosaid packing-plate to hold it in contact with the hub-face.

6. In a motor, a revoluble hub carrying cylinders, ports leading fromthe cylinders to a.

face of the hub, an admission-opening for the motive fluid, a disk orvalve plate in contact with the hub-face, an admission-chamber in saidvalve-plate, two ports leading to saidchamber,

one at each side ofthe admission-opening, a longitudinallymovablepackingplate -between the valve-plate and 4hub-face, a port in thepacking-plate to register with the cylinderports, a slip-joint betweensaid port and the chamber inthe valve-plate, pistons pressing againstthe packing-plate from chambers in the valve-plate, passages betweensaid charnbers and the admission-chamber, and means for turning thevalve-plate in either'direction '.to open -or close the admission-ports.

7. In a motor, a plurality of cylinders carried by a rotating hub,pistons therein, a fixed eccentric at one side of the hub,'andoscillating levers rotating with the cylinders, said levers beingcoupled to the pistons at one end and at theother end carrying wheels orrollers adapted'to transmit the force developed by the pistons to theperiphery of the eccentric.

l8. In a motor, a revoluble hub carrying cylinders, 'a fixed bearing atone side'thereof eccentric to the axis of the hub, pistons Within thecylinders, oscillating levers mounted upon androtating with thecylinders, and means whereby the pressure of the motive Huid upon thepistons is transmitted through said levers to the fixed bearing.

` 9. In a motor, a revoluble hub carrying cylinders, pistons therein,oscillating levers pivoted between their extremities rotating with thecylinders, one end of said levers being connected to the pistons and theother end being adapted to act upon a fixed bearing eccentric to theaxis of said hub. 10. In a motor, a shaft for transmitting the power ofthe motor, a hub carrying cylinders fixed on and adapted to rotate withthe shaft, a fixed bearing eccentric to the' shaft at one side of thehub, pistons within the cylinders, oscillating levers mounted uponv androtating with the cylinders, and means whereby the pressure of themotive fluid upon the pistons is transmitted through the levers to thefixed bearing. l1. In a motor, a shaft for transmitting the power of themotor, a hub carrying cylinders fixed thereon and adapted to rotate withthe shaft, pistons within the cylinders,

oscillating levers pivoted between their extremities rotating with thecylinders, one end of saidlevers being connected to the pistons, and theother end being adapted to act upon a xed bearing eccentric tosaidshaft.

l2. In a motor, a revoluble hub carrying cylinders, a cam-surface fixedat one side of the hub, pistons in the cylinders, oscillating leversmounted upon and rotating with the cylinders, and means for transmittingthe pressure of the' motive fiuid upon the pistons through saidoscillating levers to the calnsurface.

1 3. In a motor, a revoluble hub carrying cylinders, pistons therein,and oscillating levers or bell-cranks rotating with the cylinders, onearm of the bell-cranks being coupled to the-pistons andthe other armbeing adapted to act ,upon a fixed bearing eccentric to the axis of thehub, the latter arm being of sufficient weight .to develop duringrotation a centrifugal force approximately equal to that of the formerarm and its attached piston.

In testimony whereof I have aflixed my sig.--

nature in presence of two witnesses.

VJAMES A. SHEPARD.

Witnesses:

M. E. VERBECK, EUGENE DIVEN.

